The wiki says Vaelyn has 2 Flourishes, but she has either Grand Flourishes or Final Flourishes. I'm Defender Elite, so I don't have any missions where you can see her - Could someone check whether she has Grands or Finals?
EDIT: Help us. ISSUE RESOLVED, PLEASE EXIT THE FACILITY.
What she uses seems to be a reskinned leviathan blade so it looks like she's dual wielding. So she's not exactly using any "flourishes" per say, even though it certainly looks like it. It seems she "wields" a final flourish in the right hand (flares and light-dash on the handle, extra sparkly tip) and a grand flourish in the left (no flares on the handle, sufficient length and light-dash on handle).